A partial lunar eclipse took place on Saturday, June 25, 1983, the first of two lunar eclipses in 1983 with an umbral eclipse magnitude of 0.33479. A partial lunar eclipse happens when the Earth moves between the Sun and the Full Moon, but they are not precisely aligned. Only part of the Moon's visible surface moves into the dark part of the Earth's shadow. A partial lunar eclipse occurs when the Earth moves between the Sun and Moon but the three celestial bodies do not form a straight line in space. When that happens, a small part of the Moon's surface is covered by the darkest, central part of the Earth's shadow, called the umbra. The rest of the Moon is covered by the outer part of the Earth's shadow called the penumbra. The Earth's shadow on the moon was clearly visible in this eclipse, with 33% of the Moon in shadow; the partial eclipse lasted for 2 hours and 15 minutes.^[1]

It was completely visible over Australia, Pacific and the Americas.

• A total solar eclipse at the Moon's ascending node of the orbit on Saturday, June 11th, 1983.
• A partial lunar eclipse at the Moon's descending node of the orbit on Saturday, June 25th, 1983.
• An annular solar eclipse at the Moon's descending node of the orbit on Sunday, December 04th, 1983.
• A penumbral lunar eclipse at the Moon's ascending node of the orbit on Tuesday, December 20th, 1983.

Lunar eclipse series sets from 1980–1984
Descending node					Ascending node
Saros	Date Viewing	Type Chart	Gamma		Saros	Date Viewing	Type Chart	Gamma
109	1980 Jul 27	Penumbral	1.41391		114	1981 Jan 20	Penumbral	−1.01421
119	1981 Jul 17	Partial	0.70454		124	1982 Jan 09	Total	−0.29158
129	1982 Jul 06	Total	−0.05792		134	1982 Dec 30	Total	0.37579
139	1983 Jun 25	Partial	−0.81520		144	1983 Dec 20	Penumbral	1.07468
149	1984 Jun 13	Penumbral	−1.52403
Last set	1980 Aug 26				Last set	1980 Mar 13
Next set	1984 May 15				Next set	1984 Nov 08

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).^[2] This lunar eclipse is related to two total solar eclipses of Solar Saros 146.

June 20, 1974	June 30, 1992

Lunar Saros series 139, repeating every 18 years and 11 days, has a total of 79 lunar eclipse events including 42 umbral lunar eclipses (15 partial lunar eclipses and 27 total lunar eclipses)..

1901–2100

1911 May 13		1929 May 23		1947 Jun 03
1965 Jun 14		1983 Jun 25		2001 Jul 05
2019 Jul 16		2037 Jul 27		2055 Aug 07
2073 Aug 17		2091 Aug 29

• List of lunar eclipses
• List of 20th-century lunar eclipses

• 1983 Jun 25 chart Eclipse Predictions by Fred Espenak, NASA/GSFC